Area and Circumference of a Circle

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 × π × radius or Circumference = π × diameter.

Front

What is the formula for the area of a circle?

Back

Area = π × radius².

Front

If the radius of a circle is 5 inches, what is the diameter?

Back

Diameter = 10 inches.

Front

What is the value of π (pi) approximately?

Back

π ≈ 3.14.

Front

If the diameter of a circle is 14 cm, what is the radius?

Back

Radius = 7 cm.

Front

What is the circumference of a circle with a radius of 3 ft?

Back

Circumference = 18.84 ft.

Front

What is the area of a circle with a radius of 4 inches?

Back

Area = 50.24 inches².

Front

How do you convert diameter to radius?

Back

Radius = Diameter ÷ 2.

Front

What does the term 'radius' refer to in a circle?

Back

The radius is the distance from the center of the circle to any point on its circumference.

Front

What does the term 'diameter' refer to in a circle?

Back

The diameter is the distance across the circle through its center, equal to twice the radius.